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28 Sep 2005, 09:06

I think this is just one of those situations where you have to hope that the makers of the GMAT thought of that solution. Can they expect us to assume that this only refers to positive numbers... of course not, this is why I think something additional would have been added such as x>0 and y>0 to take care of an inconsistancy such as this one.

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28 Sep 2005, 13:21

jrabenho wrote:

I think this is just one of those situations where you have to hope that the makers of the GMAT thought of that solution. Can they expect us to assume that this only refers to positive numbers... of course not, this is why I think something additional would have been added such as x>0 and y>0 to take care of an inconsistancy such as this one.

Yes you should assume x,y >=0, integers, because without use of gamma functions (off GMAT syllabus), factorial is undefined otherwise.